CN111996349A - Production method of low-strength and high-elongation cord steel wire rod - Google Patents
Production method of low-strength and high-elongation cord steel wire rod Download PDFInfo
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- CN111996349A CN111996349A CN202010777739.9A CN202010777739A CN111996349A CN 111996349 A CN111996349 A CN 111996349A CN 202010777739 A CN202010777739 A CN 202010777739A CN 111996349 A CN111996349 A CN 111996349A
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- wire rod
- steel wire
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/06—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of rods or wires
- C21D8/065—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of rods or wires of ferrous alloys
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
- B21C37/00—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
- B21C37/04—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape of bars or wire
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D11/00—Process control or regulation for heat treatments
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- Chemical & Material Sciences (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Manufacturing & Machinery (AREA)
- Heat Treatment Of Steel (AREA)
Abstract
The invention relates to a production method of a low-strength and high-elongation cord steel wire rod, which comprises the working procedures of smelting, continuous casting and continuous rolling, coping, billet heating, rolling, spinning and controlled cooling; the tensile strength of the produced cord steel wire rod is 950-1020 MPa, the interlayer spacing of the pearlite plates is 0.2-0.25 mu m, the surface shrinkage is more than 40%, and the sorbitizing rate is 60-70%. The method adopts the method of hot-machine rolling and properly reducing the cooling speed after spinning to produce the low-strength and high-elongation cord steel wire rod with excellent indexes, thereby not only ensuring the subsequent drawing performance of the wire rod, but also improving the fatigue performance of the product by more than 15 percent, further prolonging the service cycle of the material and saving the material.
Description
Technical Field
The invention relates to the technical field of wire rod production, in particular to a production method of a low-strength and high-elongation cord steel wire rod.
Background
The steel cord is praised as bright bead on the crown of wire rod product, and it is used as skeleton material of automobile tyre, and has the features of high strength, good heat radiation, strong cutting resistance, stable size, good buffering property, etc. so that it can make new-generation tyre-radial tyre possess the advantages of large load, long service life, comfortable and safe ride, energy-saving property, etc. The framework material for the rubber industry is a fiber material and a metal framework material, wherein the fiber material is successively used for a cotton cord, a glass fiber cord, a rayon cord, a polyester cord and a nylon cord. The metal framework material has a plurality of varieties, wherein the steel cord is used in a large amount and has the most strict quality requirement.
With the increasing requirements of weight reduction and light weight of automobiles, the specification of customizing the steel wire cord of the tire is more complicated and fine. For example, the specification of steel cords of ordinary strength grade is developed from 2+2 × 0.25 to more elaborate and complicated 3+9+15 × 0.175+0.15 NT. The specification of high strength grade steel cords is developed from 2 × 0.30 to 3+9+15 × 0.22+1NT and 3 × 0.20NT +6 × 0.35 HT. The requirements of the products all put high requirements on the performance of the steel wire rod for wire making, such as indexes of reticular cementite, inclusion, decarburization of the wire rod and the like are very strict.
At the present stage, the high-strength cord steel is a future development trend, and many scholars at home and abroad concentrate on the development of the high-strength cord steel, so that the mechanical property of parts can be effectively improved by improving the strength of the cord steel, and the vehicle weight can be reduced. However, no relevant report is provided at home and abroad for the development of the low-strength high-elongation cord steel. The low-strength high-elongation cord steel is characterized in that the chemical components and other quality indexes (except tensile strength) of the cord steel are not changed, the average tensile strength of a wire rod is reduced to be below 1020MPa from 1150MPa mainly by designing a wire rod rolling process, the surface shrinkage is improved to be above 40% from above 35%, and the sorbitizing rate is reduced to 60% -70% from above 90%; on the premise of not changing the application level of the product, the low-strength high-elongation cord steel not only ensures the subsequent drawing performance, but also improves the fatigue performance of the product by more than 15 percent, prolongs the service cycle of the material and saves the material. However, the difficulty in developing low-strength and high-elongation cord steel products lies in the control of the wire rod reticular cementite, the basic process design idea is hot-machine rolling, rapid cooling and air cooling, and the difficulty in controlling the reticular cementite is high because the hot-machine rolling can induce the cementite to be separated out. The research and the preparation of the optimal process are the key points for solving the problem of cementite precipitation by comprehensively considering the tensile strength of the wire rod and the index of the reticular cementite.
Based on the above analysis, on the premise of ensuring various performance indexes of the product, the development of the low-strength, high-elongation, green and energy-saving cord steel is one of the main research directions in the future. The Chinese patent application with the publication number of CN109957711A discloses 'a cord steel wire rod and a production method', which is a production method of 90-grade high-strength cord steel and does not relate to a production process of low-strength wire rods; the Chinese patent application with the publication number of CN110747386A discloses an easy-to-draw cord steel wire rod and a production method thereof, which relates to a production method of LX82A and LX86A easy-to-draw cord steel wire rods, and aims to improve the comprehensive quality of the wire rod and further improve the subsequent drawing performance by improving the cleanliness, reducing the center segregation degree, improving the surface quality of the wire rod and the like, but the method does not mention the easy-to-draw goal realized by reducing the strength of the wire rod, and does not relate to the strength index and the strength reducing process of the wire rod.
Disclosure of Invention
The invention provides a production method of a low-strength and high-elongation cord steel wire rod, which adopts the method of hot-machine rolling and properly reducing the cooling speed after spinning to produce the low-strength and high-elongation cord steel wire rod with excellent indexes, thereby not only ensuring the subsequent drawing performance of the wire rod, but also improving the fatigue performance of the product by more than 15 percent, further prolonging the service life of materials and saving the materials.
In order to achieve the purpose, the invention adopts the following technical scheme:
a production method of a low-strength and high-elongation cord steel wire rod comprises the working procedures of smelting, continuous casting and continuous rolling, coping, billet heating, rolling, spinning and controlled cooling; wherein:
1) a billet heating procedure: the heating temperature is controlled to be 1050-1150 ℃, the furnace time is 3-3.5 hours, high-pressure water descaling is carried out after the furnace is taken out, and the water outlet pressure is 15-23 MPa;
2) a rolling procedure: controlling the rolled piece finish rolling temperature to be 850-950 ℃; the temperature of the rolled piece in a double-module rolling mill is controlled to be 750-850 ℃;
3) a spinning process: controlling the spinning temperature of the wire rod to be 800-860 ℃;
4) and (3) controlled cooling process: and a fast cooling and air cooling process is adopted, so that the cooling speed before phase change is controlled within 5-15 m/s, and the cooling speed after phase change is controlled within 5 m/s.
The tensile strength of the cord steel wire rod is 950-1020 MPa, the interlayer spacing of the pearlite plates is 0.2-0.25 mu m, the surface shrinkage is more than 40%, and the sorbitizing rate is 60-70%.
The finished product specification of the cord steel wire rod is as follows
Compared with the prior art, the invention has the beneficial effects that:
1) the invention is suitable for
Compared with the 80-grade cord steel wire rod produced by adopting the conventional process, the production of the 80-grade cord steel reduces the average tensile strength by 130MPa, improves the pearlite lamella spacing by 0.05-0.08 mu m, improves the surface shrinkage by more than 5 percent on average, and reduces the sorbitizing rate by 20-30 percent.
2) The cord steel wire rod is applied to the same grade steel cord, the broken wire rate in the drawing process is reduced from 2-3 times/ton to 0, and the fatigue performance is improved by more than 15%.
Detailed Description
The invention relates to a production method of a low-strength and high-elongation cord steel wire rod, which comprises the working procedures of smelting, continuous casting and continuous rolling, coping, billet heating, rolling, spinning and controlled cooling; wherein:
1) a billet heating procedure: the heating temperature is controlled to be 1050-1150 ℃, the furnace time is 3-3.5 hours, the segregation of elements such as carbon, manganese and the like is reduced through the high-temperature diffusion of the steel billet, and favorable conditions are provided for the control of the reticular cementite in the subsequent controlled cooling stage. After the billet is taken out of the furnace, high-pressure water descaling is carried out, and the water outlet pressure is 15-23 MPa;
2) a rolling procedure: controlling the rolled piece feeding finish rolling temperature to be 850-950 ℃; the temperature of the rolled piece in a double-module rolling mill is controlled to be 750-850 ℃; the rolled piece is in a low-temperature rolling state, austenite grain size before phase change of the wire rod is refined, tissue storage energy is increased, austenite to pearlite transformation of the wire rod at a higher temperature in a cooling process is promoted, pearlite lamellar spacing is increased, and meanwhile, plasticity and toughness of the material are improved.
3) A spinning process: controlling the spinning temperature of the wire rod to be 800-860 ℃; through low-temperature spinning, austenite crystal grain growth is inhibited, the wire rod has relatively thick pearlite lamellar spacing, and the tensile strength of the wire rod is effectively reduced.
4) And (3) controlled cooling process: and a fast cooling and air cooling process is adopted, so that the cooling speed before phase change is controlled within 5-15 m/s, and the cooling speed after phase change is controlled within 5 m/s. Different from the traditional process method of ultra-fast cooling for high-carbon steel, the method controls reasonable cooling speed after delayed cooling, not only inhibits the precipitation of reticular cementite of the wire rod, but also increases the interlamellar spacing of pearlite, and effectively reduces the strength of the wire rod and the sorbitizing rate.
The tensile strength of the cord steel wire rod is 950-1020 MPa, the interlayer spacing of the pearlite plates is 0.2-0.25 mu m, the surface shrinkage is more than 40%, and the sorbitizing rate is 60-70%.
The finished product specification of the cord steel wire rod is as follows
The following examples are carried out on the premise of the technical scheme of the invention, and detailed embodiments and specific operation processes are given, but the scope of the invention is not limited to the following examples. The methods used in the following examples are conventional methods unless otherwise specified.
[ examples ] A method for producing a compound
In the embodiment, the production method of the low-strength and high-elongation cord steel wire rod comprises the working procedures of smelting, continuous casting and continuous rolling, billet polishing, billet heating, rolling, spinning and controlled cooling. The main process parameters and wire rod properties are shown in tables 1 and 2.
TABLE 1 Main Process parameters
TABLE 2 wire rod Properties and use Properties
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.
Claims (3)
1. A production method of a low-strength and high-elongation cord steel wire rod comprises the working procedures of smelting, continuous casting and continuous rolling, coping, billet heating, rolling, spinning and controlled cooling; it is characterized in that:
1) a billet heating procedure: the heating temperature is controlled to be 1050-1150 ℃, the furnace time is 3-3.5 hours, high-pressure water descaling is carried out after the furnace is taken out, and the water outlet pressure is 15-23 MPa;
2) a rolling procedure: controlling the rolled piece finish rolling temperature to be 850-950 ℃; the temperature of the rolled piece in a double-module rolling mill is controlled to be 750-850 ℃;
3) a spinning process: controlling the spinning temperature of the wire rod to be 800-860 ℃;
4) and (3) controlled cooling process: and a fast cooling and air cooling process is adopted, so that the cooling speed before phase change is controlled within 5-15 m/s, and the cooling speed after phase change is controlled within 5 m/s.
2. The method for producing a low-strength high-elongation steel wire rod for cord thread according to claim 1, wherein the steel wire rod for cord thread has a tensile strength of 950 to 1020MPa, a pearlite inter-layer distance of 0.2 to 0.25 μm, a face shrinkage of 40% or more, and a sorbitizing rate of 60 to 70%.
3. A method of producing a low strength, high elongation cord steel wire rod as claimed in claim 1 wherein said cord steel wire rod is finished to a finished gauge
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010777739.9A CN111996349A (en) | 2020-08-05 | 2020-08-05 | Production method of low-strength and high-elongation cord steel wire rod |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010777739.9A CN111996349A (en) | 2020-08-05 | 2020-08-05 | Production method of low-strength and high-elongation cord steel wire rod |
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| Publication Number | Publication Date |
|---|---|
| CN111996349A true CN111996349A (en) | 2020-11-27 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202010777739.9A Pending CN111996349A (en) | 2020-08-05 | 2020-08-05 | Production method of low-strength and high-elongation cord steel wire rod |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113637907A (en) * | 2021-07-30 | 2021-11-12 | 武汉钢铁有限公司 | Production method of 72-grade cord steel with coarse breaking rate lower than 1.0 per kiloton |
| CN113913681A (en) * | 2021-08-26 | 2022-01-11 | 武汉钢铁有限公司 | High-strength low-wire-breakage-rate cord steel, rolling method and application thereof |
| CN114134410A (en) * | 2021-10-08 | 2022-03-04 | 江阴兴澄合金材料有限公司 | Cord steel wire rod suitable for deep drawing and manufacturing method thereof |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1991012346A1 (en) * | 1990-02-15 | 1991-08-22 | Sumitomo Metal Industries, Ltd. | Process for producing steel wire for drawing |
| CN102876983A (en) * | 2012-09-29 | 2013-01-16 | 攀钢集团成都钢钒有限公司 | Production process for 82B wire rod used for high strength prestressed steel wire and wire rod thereof |
| CN102912101A (en) * | 2012-10-19 | 2013-02-06 | 攀钢集团成都钢钒有限公司 | Production process of 65 Mn spring steel wire rod and 65 Mn spring steel wire rod |
| CN105316573A (en) * | 2014-06-23 | 2016-02-10 | 鞍钢股份有限公司 | 80-grade tire cord steel wire rod being suitable for acidic-pickling descaling and production method of same |
| CN105483557A (en) * | 2014-09-26 | 2016-04-13 | 鞍钢股份有限公司 | Steel wire rod for 80 grade core thread external winding wire and manufacturing method of steel wire rod |
| CN111069280A (en) * | 2019-11-30 | 2020-04-28 | 江苏省沙钢钢铁研究院有限公司 | Production method of low-strength cord steel wire rod |
-
2020
- 2020-08-05 CN CN202010777739.9A patent/CN111996349A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1991012346A1 (en) * | 1990-02-15 | 1991-08-22 | Sumitomo Metal Industries, Ltd. | Process for producing steel wire for drawing |
| CN102876983A (en) * | 2012-09-29 | 2013-01-16 | 攀钢集团成都钢钒有限公司 | Production process for 82B wire rod used for high strength prestressed steel wire and wire rod thereof |
| CN102912101A (en) * | 2012-10-19 | 2013-02-06 | 攀钢集团成都钢钒有限公司 | Production process of 65 Mn spring steel wire rod and 65 Mn spring steel wire rod |
| CN105316573A (en) * | 2014-06-23 | 2016-02-10 | 鞍钢股份有限公司 | 80-grade tire cord steel wire rod being suitable for acidic-pickling descaling and production method of same |
| CN105483557A (en) * | 2014-09-26 | 2016-04-13 | 鞍钢股份有限公司 | Steel wire rod for 80 grade core thread external winding wire and manufacturing method of steel wire rod |
| CN111069280A (en) * | 2019-11-30 | 2020-04-28 | 江苏省沙钢钢铁研究院有限公司 | Production method of low-strength cord steel wire rod |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113637907A (en) * | 2021-07-30 | 2021-11-12 | 武汉钢铁有限公司 | Production method of 72-grade cord steel with coarse breaking rate lower than 1.0 per kiloton |
| CN113913681A (en) * | 2021-08-26 | 2022-01-11 | 武汉钢铁有限公司 | High-strength low-wire-breakage-rate cord steel, rolling method and application thereof |
| CN113913681B (en) * | 2021-08-26 | 2022-03-25 | 武汉钢铁有限公司 | High-strength low-wire-breakage-rate cord steel, rolling method and application thereof |
| CN114134410A (en) * | 2021-10-08 | 2022-03-04 | 江阴兴澄合金材料有限公司 | Cord steel wire rod suitable for deep drawing and manufacturing method thereof |
| WO2023056658A1 (en) * | 2021-10-08 | 2023-04-13 | 江阴兴澄合金材料有限公司 | Cord steel wire rod suitable for deep drawing and manufacturing method therefor |
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Application publication date: 20201127 |